Analyzing and documenting the traceability can be done using reports. See the report section for details.
Alternatively you can also get a real time view in the traceability dashboard. (Tools > DASHBOARDS > TRACE)
In there you can see information about items with missing up or downlinks / compared to items with all links. By clicking on a pie segment you can filter the list below to show only these items. In the top right you can also restrict the graph to only one category.
All the selected information can easily be copied clicking on the "copy to clipboard" icon right besides "Overview".
This traceability can also be specifically in single folder inside the tree. This will provide narrowed information regarding the traceability of the items belonging to the folder: